Progesterone Supplement

Hi ladies! I just started 200 mg of progesterone pills. I had a miscarriage in May and got pregnant again within weeks. My progesterone level dropped from 26 to 16 in a week, but the dr said she is not concerned and everything looks good. In fact I had to insist on the supplement because I'm so worried. Anyone else taking progesterone have experimence or advice to share? Does it make you sick? Do you take it the entire pregnancy?